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用于光电化学水分解的CoO纳米花瓣/ZnO纳米板p-n结的直接电化学合成。

Straightforward electrochemical synthesis of a CoO nanopetal/ZnO nanoplate p-n junction for photoelectrochemical water splitting.

作者信息

Nguyen Khanh Quang, Nguyen Hoang Thai, Bui Thach Khac, Nguyen Tien-Thanh, Pham Viet Van

机构信息

Advanced Materials and Applications Research Group (AMA), HUTECH University 475A Dien Bien Phu Street, Binh Thanh District Ho Chi Minh City 700000 Vietnam

University of Science Ho Chi Minh City Vietnam.

出版信息

Nanoscale Adv. 2024 Jun 18;6(16):4167-4179. doi: 10.1039/d4na00036f. eCollection 2024 Aug 6.

DOI:10.1039/d4na00036f
PMID:39114138
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11302054/
Abstract

Hydrogen production through photoelectrochemical (PEC) reactions is an innovative and promising approach to producing clean energy. The PEC working electrode of a CoO/ZnO-based p-n heterojunction was prepared by a straightforward electrochemical deposition with different deposition times onto an FTO (Fluorine-doped Tin Oxide) glass substrate. The successful synthesis of the materials was confirmed through analysis using XRD, FTIR, SEM-EDX, DRS, and PL techniques. Mott-Schottky plots and some characterization studies also checked the determination of the formation of the p-n junction. CoO/ZnO/FTO with a CoO deposition time of 2 minutes exhibited the lowest onset potential of 0.82 V and the lowest overpotential of 470 mV at a current density of 10 mA cm . Furthermore, the photo-conversion efficiency of the CoO/ZnO/FTO sample showed 1.4 times higher current density than the ZnO/FTO sample. A mechanism is also proposed to enhance the CoO/ZnO/FTO electrode photo-electrocatalytic activity involved in the water-splitting reaction. The CoO/ZnO/FTO electrode shows significant potential as a promising PEC electrode to produce hydrogen.

摘要

通过光电化学（PEC）反应制氢是一种创新且有前景的清洁能源生产方法。基于CoO/ZnO的p-n异质结的PEC工作电极是通过在FTO（氟掺杂氧化锡）玻璃基板上进行不同沉积时间的直接电化学沉积制备的。通过使用XRD、FTIR、SEM-EDX、DRS和PL技术进行分析，证实了材料的成功合成。莫特-肖特基图和一些表征研究也检查了p-n结形成的测定。CoO沉积时间为2分钟的CoO/ZnO/FTO在电流密度为10 mA cm时表现出最低的起始电位0.82 V和最低的过电位470 mV。此外，CoO/ZnO/FTO样品的光转换效率显示出比ZnO/FTO样品高1.4倍的电流密度。还提出了一种机制来增强参与水分解反应的CoO/ZnO/FTO电极的光电催化活性。CoO/ZnO/FTO电极作为一种有前景的用于制氢的PEC电极显示出巨大潜力。

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本文引用的文献

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Construction of n-type homogeneous to improve interfacial carrier transfer for enhanced photoelectrocatalytic hydrolysis.构建n型同质结构以改善界面载流子转移，从而增强光电催化水解。
J Colloid Interface Sci. 2024 Mar 15;658:258-266. doi: 10.1016/j.jcis.2023.12.080. Epub 2023 Dec 12.
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High-Voltage-Enabled Stable Cobalt Species Deposition on MnO for Water Oxidation in Acid.
用于酸性条件下水氧化的MnO上高压驱动的稳定钴物种沉积
Adv Mater. 2023 Mar;35(13):e2207066. doi: 10.1002/adma.202207066. Epub 2023 Feb 13.
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Solar-to-hydrogen efficiency of more than 9% in photocatalytic water splitting.光催化水分解中太阳能到氢能的效率超过9%。
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